Alaska Glacier Flooding: Capital Faces Record River Levels
Temporary Levee Aims too Protect Juneau from Glacier Outburst Floods
Table of Contents
Juneau, Alaska, is facing a unique challenge: outburst floods caused by the Mendenhall Glacier. As the glacier acts as an ice dam,sealing off a basin,the city is taking action to protect its residents and properties. Let’s dive into the details of this ongoing situation and the measures being taken to mitigate the risks.
the Threat of Glacier Outburst Floods
Outburst floods, also known as glacial lake outburst floods (GLOFs), occur when a glacier-dammed lake suddenly releases its water. In Juneau’s case, the mendenhall Glacier is the culprit, creating a situation that could persist for another 25 to 60 years, according to researchers.
These floods can be devastating, causing critically important damage to infrastructure and property.The unpredictable nature of these events makes it crucial to implement proactive measures to safeguard the community.
A Temporary Solution: The Hesco Barrier Levee
In response to growing concerns from property owners, city officials have collaborated with state, federal, and tribal entities to install a temporary levee. This levee stretches along roughly 2.5 miles of the riverbank and is designed to protect against widespread flooding.
What are Hesco Barriers?
The levee is constructed using 10,000 “Hesco” barriers. Think of them as giant, super-durable sandbags. Emergency manager Ryan O’Shaughnessy explains that these barriers are intended to entirely protect more than 460 properties during an 18-foot flood event.
How Effective Are They?
While the Hesco barrier levee offers a degree of protection, it’s essential to remember that it’s a temporary solution. It provides a crucial buffer while longer-term strategies are developed and implemented.
The Search for a Permanent Solution
The U.S. Army Corps of Engineers has initiated a years-long process to study the conditions in the region and explore options for a more permanent solution, such as a permanent levee.
Residents’ Concerns
The timeline for this permanent solution has frustrated some residents, who feel it’s taking too long. The urgency of the situation is understandable, given the potential for continued outburst floods in the coming decades.
The Long-Term Outlook
Researchers indicate that outburst floods are expected to continue provided that the Mendenhall Glacier acts as an ice dam. This highlights the need for both immediate and long-term strategies to manage the risks effectively.
ClimateWatch and the Bigger Picture
The situation in Juneau is a stark reminder of the impacts of climate change on our communities. Glacial melting and the resulting outburst floods are just one example of the challenges we face.
stay informed about climate change news and features to understand the broader context of these events and the importance of taking action to mitigate their effects.